벌갱이

Etymology
Related to 🇨🇬; see there for more. The "Communist" sense is a pun from.

Noun

 * 1) bug, insect (any small arthropod such as insects, spiders, etc.)
 * 2)  worm (a repulsive person)
 * 3)  someone who is obsessed with something
 * 4)  Communist filth, commie worm, vile leftist
 * 1)  someone who is obsessed with something
 * 2)  Communist filth, commie worm, vile leftist
 * 1)  Communist filth, commie worm, vile leftist

Usage notes
The most common realization of the second syllable is as a nasal vowel, which cannot be written normally in hangul and is variably transcribed with or simply as a normal vowel. The conventional practice in Korean academia is to use a tilde after the syllable in question, but this is virtually never done by non-linguists.